Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Benefit Plans [Abstract]
Defined contribution plan, employer matching contribution, percent	4.00%
Defined contribution plan, vesting percentage	100.00%
Employer contributions to 401(k) plan	$ 1.6	$ 2.0	$ 2.0
Defined benefit pension plan, assets	5.5
Defined benefit pension plan, liabilities	6.7
Net liabilities included on the balane sheet	$ (1.2)	$ (1.6)